I am a college student in a Fire Prevention class and in the lab that we do fire experiments we have a hand held extinguisher that is round, (it looks like a ball) and has your typical discharge handle. This is not a fire grenade, it looks like a modern extinguisher its just round. You can't even set this thing down without it rolling around. I was wondering if anyone knew anything about this extinguisher or knew where I could get some information about the extinguisher.